234143804-Endo-MCQS.docx - 1 1 If the maxillary first molar...

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1. 1. If the maxillary first molar is found to have 4 canals, the 4th canal is most found : a. In the disto-buccal rootb. In the mesio-buccal rootc. In the palatal rootd. All of the above 2. Step back or backfilling means; to instrument the root canal to the full length predetermined working length . a. True b. False 3. The " Working Length" of a tooth refers to: 4. A central incisor diagnostic (pre operative) radiograph image measures 25mm from the incisal edge to the root apex. The estimated (initial) working length is : 5. You are taking a working length radiograph of a normally positioned maxillary premolar with 2 equal length roots. In the mesial shift (relative to the "normal" diagnostic radiograph) the palatal root apex in relation to the zygomatic process "moves" to the: 6. The main objective of root canal obturation is to allow an ingress of tissue fluid exudates into the root canal space. a. True b. False 7. Gutta Percha points consist mostly of: a. Gutta Perchab. Zinc oxidec. Zinc phosphate
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d. Glass ionomer 8. Requirements of an ideal root canal filling material include the following except : a. Dimensional stability: no shrinkage after insertion b. Non-irritant to periapical tissue c. Radiolucent when viewed by radiograph d. Easy to remove from the canal if necessary 9. Leaving the tooth open between appointment during root canal therapy could lead to: a. Healing of the periapical lesion b. Bacterial contamination of the root canal system c. Neither A nor B 10. In instrumentation you should use a curved file. 11. Root canal sealer cement is used mainly to: 12. An irrigating solution is used during root canal therapy to: 13. Which of the following are explanation as to why the initial gutta percha master cone will not completely go to full working length even though it is same number as the last enlarging instrument used? a. Debris remain in the canalb. A ledge exists in the canal upon which the point is catchingc. None of the aboved. All of the above
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